LED headlamps will offer several advantages. The lifetime of a car is around 5000 hours. The lifetime of LEDs exceeds this value considerably. Another great advantage is the exterior appearance of a headlamp. It is possible to create a couple of small modules which employ one or more LEDs and combine them to the desired design. The bluish light conveys to the lamp a technical image. Due to the enormous progress in LED development, high brightness LEDs are now available for automotive exterior front lighting. Even the implementation of functions like low and high beam is feasible. Nevertheless, the LED characteristics are completely different of those of the light sources used in traditional headlamp systems. The characteristics include not only optical aspects, but also electrical, mechanical and temperature issues. These characteristics make new approaches in the field of automotive headlamp development necessary. The paper discusses new highly efficient optical design methods to create front signal functions like daytime running light or turn indicator weather with medium brightness LEDs (1 lm to 10 lm per LED) or with high brightness LEDs (30 lm to 100 lm per LED). A space optimized full LED headlamp, which fulfils the regulations but consume much less space compared to a halogen headlamp is presented. A light performance optimized full LED headlamp, which reaches xenon headlamp performance and fits in a current headlamp housing is described.
Optical approach for LED headlamps
Optische Aspekte im Entwurf von LED-Scheinwerfern
2005
12 Seiten, 12 Bilder, 2 Tabellen, 9 Quellen
Conference paper
English
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